<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=US-ASCII">
<title>Untangle</title>
<link rel="previous" href="dominosa.html">
<link rel="ToC" href="index.html">
<link rel="up" href="index.html">
<link rel="index" href="docindex.html">
<link rel="next" href="blackbox.html">
</head>
<body>
<p><a href="dominosa.html">Previous</a> | <a href="index.html">Contents</a> | <a href="docindex.html">Index</a> | <a href="blackbox.html">Next</a></p>
<h1><a name="C18"></a>Chapter 18: <a name="i0"></a>Untangle</h1>
<p>
You are given a number of points, some of which have lines drawn between them. You can move the points about arbitrarily; your aim is to position the points so that no line crosses another.
</p>
<p>
I originally saw this in the form of a Flash game called <a name="i1"></a>Planarity <a href="#p0">[7]</a>, written by John Tantalo.
</p>
<p><a name="p0"></a>
[7] <a href="http://home.cwru.edu/~jnt5/Planarity"><code>http://home.cwru.edu/~jnt5/Planarity</code></a>
</p>
<h2><a name="S18.1"></a>18.1 <a name="i2"></a>Untangle controls</h2>
<p>
To move a point, click on it with the left mouse button and drag it into a new position.
</p>
<p>
(All the actions described in <a href="common.html#S2.2">section 2.2</a> are also available.)
</p>
<h2><a name="S18.2"></a>18.2 <a name="i3"></a>Untangle parameters</h2>
<p>
There is only one parameter available from the &#8216;Custom...&#8217; option on the &#8216;Type&#8217; menu:
</p>
<dl><dt>
<em>Number of points</em>
</dt>
<dd>
Controls the size of the puzzle, by specifying the number of points in the generated graph.
</dd>
</dl>

<hr><address>
[Puzzles S60 version 1.4.r8997]</address></body>
</html>
